Climate forcing and the initiation of glacier advance during MIS-2 in the North Sikkim Himalaya, India

Ali, Sheikh Nawaz; Dubey, Jyotsna; Morthekai, P.; Sharma, Anupam; Singh, Rupendra; Prizomwala, S. P.

doi:10.1016/j.jseaes.2019.02.005

Cited by 17 publications

(7 citation statements)

References 76 publications

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“…However, a recent study from the North Sikkim Himalaya, India, suggests glacial standstill conditions at 28±2.8 ka, which were sustained until 22±2.4 ka (Ali et al . 2019), whereas the same stage (Stage‐I) deglaciation was suggested between 18±2.2 and 15±1.6 ka. From ~28 to ~18 ka, Stage‐I was suggested to be in a standstill condition for ~10 ka at ~16 km downstream from the present‐day snout and nourished until the end of the LGM (Ali et al .…”

Section: Regional Glacial and Climate Correlationmentioning

confidence: 82%

“…From ~28 to ~18 ka, Stage‐I was suggested to be in a standstill condition for ~10 ka at ~16 km downstream from the present‐day snout and nourished until the end of the LGM (Ali et al . 2019). Further, Ali et al .…”

Section: Regional Glacial and Climate Correlationmentioning

confidence: 99%

“…Further, Ali et al . (2019) suggested that the glacier could remain in a standstill condition (~10 ka) in a monsoon dominated region (Sikkim Himalaya). Whereas, under more favourable topographic and climatic conditions, glaciers in the Dunagiri valley were possibly in standstill condition from 18 to 13 ka.…”

Section: Regional Glacial and Climate Correlationmentioning

confidence: 99%

See 2 more Smart Citations

‘Chronology and climate sensitivity of the post‐LGM glaciation in the Dunagiri valley, Dhauliganga basin, Central Himalaya, India’: Reply to comments

Kumar

Shukla

Mehta

et al. 2020

Boreas

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Section: Regional Glacial and Climate Correlationmentioning

confidence: 82%

Section: Regional Glacial and Climate Correlationmentioning

confidence: 99%

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‘Chronology and climate sensitivity of the post‐LGM glaciation in the Dunagiri valley, Dhauliganga basin, Central Himalaya, India’: Reply to comments

Kumar

Shukla

Mehta

et al. 2020

Boreas

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“…The valley has preserved evidence of both erosional and depositional glacial, and glacio-fluvial landforms in the form of moraines, cirque basins, glacial valleys, rock glaciers, and extensive outwash plains, among other things. Dubey et al (2018Dubey et al ( , 2019 and Ali et al (2018Ali et al ( , 2019 provide further information regarding the research field. Since there is no meteorological data available for this area, climate data through Climatic Research Unit (CRU TS.30.24, 0.5 latitude × 0.5 longitude, 1901-2015 CE) (Harris et al, 2014 ) was used.…”

Section: Study Areamentioning

confidence: 99%

Vegetation diversity in response to monsoonal variability in the Eastern Himalaya, India over the past ~13 000 yrs

Dubey,

Ali,

Quamar

et al. 2024

The Holocene

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Monsoon precipitation plays a crucial role in shaping the diversity of vegetation in the Himalayas, both in terms of temporal and spatial distribution. While palynology has traditionally been employed to reconstruct the past climate of the Himalaya, there has been limited understanding of how monsoon-related changes affect the structure and distribution of vegetation. To address this, we analysed pollen data from a 3 m deep sedimentary profile in the higher Sikkim Himalaya to reconstruct monsoon driven changes in vegetation diversity. Our results show a highly fluctuating trend of pollen and diversity parameters at late-Pleistocene-Holocene transition for which fluctuating hydroclimatic conditions and differential pollen preservation in coarser sediments is attributed. During the Early Holocene (10,438–7934 cal yrs BP) favourable hydroclimatic conditions led to a rapid expansion of mixed broad-leaved forests, marked by higher values of richness and alpha diversity. Between 7934 and 5481 cal yrs BP, the region experienced moderate hydroclimatic conditions that facilitated expansion and diversification of woody taxa, and correlated with the global Holocene Climate Optimum (HCO). Conversely, from 5481 to3949 cal yrs BP, declining total pollen count (TPC), species richness, and alpha diversity indicates significant shifts in vegetation composition under deteriorating climatic conditions, which corresponds with the 4.2 ka event worldwide. From 3949 to 2049 cal yrs BP, an increasing yet variable trend in TPC and diversity indices, suggests warm-humid conditions prevailed in the region. During the last 1086 cal yrs, an increasing trend is recorded in the palyno assemblage and diversity parameters suggesting ameliorating climate, matches well with the Mediaeval Climate Anomaly (MCA). Our inferences suggest that the palyno assemblage and diversity parameters are quiet sensitive to warm and humid conditions.

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“…The basin receives sediments from the rising Himalaya in the north and from the subdued peripheral bulge in the south, and river pattern, sediment supply and weathering follow foreland tectonics and climate gradient (Maharana et al, 2018;Jain et al, 2019;Ghosh et al, 2019). The rivers respond to extreme hydrological events, sediment flux and anthropogenic pressures, and change their planform and courses frequently, e.g., Kosi in the eastern Ganga plain is hyper-avulsive that avulsed during 2008;a recent study using high resolution topographic mapping and GIS framework evolved an avulsion threshold for this river (Sinha et al, 2014b;Singh et al, 2019). The relative contribution of sediments from within and the two sources, separately, has varied in the past and the position of axial river of the basin has moved northsouth accordingly (Sinha et al, 2009;Shukla et al, 2012;Tripathi et al, 2013).…”

Section: Sedimentation In Ganga Forelandmentioning

confidence: 99%

Landscape evolution of Rivers in the Ganga Plain and Himalaya

Srivastava¹

2020

PINSA

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Rivers in Himalaya and Ganga foreland respond to the tectonics and climate operating in its geomorphic continuum. The landscape of river systems draining the two continental scale geomorphic entities evolve at various spatio-temporal scales. The studies during the last five years in India have largely focused on understanding the climate-tectonic forcing and sensitivity of landscape responses and utilized high resolution geomorphic mapping, sedimentology, and luminescence chronology. A newer dimension of river/sediment connectivity, between the source and sink, in terms of sediment erosion/ delivery and storages has been initiated. Overall, >85 research articles were published that can be classified into (i) River aggradation-incision, paleofloods and neotectonic deformation in the Himalaya, (ii) Glacial morphostratigraphy in river headwaters, (iii) Sedimentation in the Ganga foreland, and (iv) River connectivity between the Himalaya and Ganga Plain.

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Climate forcing and the initiation of glacier advance during MIS-2 in the North Sikkim Himalaya, India

Cited by 17 publications

References 76 publications

‘Chronology and climate sensitivity of the post‐LGM glaciation in the Dunagiri valley, Dhauliganga basin, Central Himalaya, India’: Reply to comments

‘Chronology and climate sensitivity of the post‐LGM glaciation in the Dunagiri valley, Dhauliganga basin, Central Himalaya, India’: Reply to comments

Vegetation diversity in response to monsoonal variability in the Eastern Himalaya, India over the past ~13 000 yrs

Landscape evolution of Rivers in the Ganga Plain and Himalaya

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